Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays

Shane Ardo; Sang Hee Park; Emily L. Warren; Nathan S. Lewis

doi:10.1039/c5ee00227c

Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays

Shane Ardo, Sang Hee Park, Emily L. Warren, Nathan S. Lewis

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Free-standing, membrane-embedded, Si microwire arrays have been used to affect the solar-driven, unassisted splitting of HI into H₂ and I₃^-. The Si microwire arrays were grown by a chemical-vapor-deposition vapor-liquid-solid growth process using Cu growth catalysts, with a radial n⁺p junction then formed on each microwire. A Nafion proton-exchange membrane was introduced between the microwires and Pt electrocatalysts were then photoelectrochemically deposited on the microwires. The composite Si/Pt-Nafion membrane was mechanically removed from the growth substrate, and Pt electrocatalysts were then also deposited on the back side of the structure. The resulting membrane-bound Si microwire arrays spontaneously split concentrated HI into H₂(g) and I₃^- under 1 Sun of simulated solar illumination. The reaction products (i.e. H₂ and I₃^-) were confirmed by mass spectrometry and ultraviolet-visible electronic absorption spectroscopy.

Original language	English
Pages (from-to)	1484-1492
Number of pages	9
Journal	Energy and Environmental Science
Volume	8
Issue number	5
DOIs	https://doi.org/10.1039/c5ee00227c
Publication status	Published - May 1 2015

ASJC Scopus subject areas

Environmental Chemistry
Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Pollution

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title = "Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays",

abstract = "Free-standing, membrane-embedded, Si microwire arrays have been used to affect the solar-driven, unassisted splitting of HI into H2 and I3-. The Si microwire arrays were grown by a chemical-vapor-deposition vapor-liquid-solid growth process using Cu growth catalysts, with a radial n+p junction then formed on each microwire. A Nafion proton-exchange membrane was introduced between the microwires and Pt electrocatalysts were then photoelectrochemically deposited on the microwires. The composite Si/Pt-Nafion membrane was mechanically removed from the growth substrate, and Pt electrocatalysts were then also deposited on the back side of the structure. The resulting membrane-bound Si microwire arrays spontaneously split concentrated HI into H2(g) and I3- under 1 Sun of simulated solar illumination. The reaction products (i.e. H2 and I3-) were confirmed by mass spectrometry and ultraviolet-visible electronic absorption spectroscopy.",

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